Just a note about the oil scavenge pump... I don't understand why so many how-to articles and videos insist that preserving the pump's orientation using a marker is a must, when the pump's orientation is cast into the face — 1-3 for bank 1, 4-6 for bank 2. As long as the cast numbers on the left side (inside) correspond to that bank's cylinder numbers, it's impossible to make a mistake and mount it upside down. Here's a photo from Pelican's technical article, although the article makes no mention of the cast numbers (which are hard to see in the photo):
